Questions tagged [high-current]
Say how much current is required, high-current means different things to different people.
1
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1answer
67 views
High voltage and current
I have a DC motor that needs and works nearly 400v and 20A. I chose FDL100N50 for n-channel mosfet also IXTK40P50P for p-channel mosfet.
I connect a 4n35 optocupler for output of every mosfet.
Are ...
1
vote
2answers
98 views
Joining high current wires outdoors
I am conducting an experiment where I would like to heat up 18 AWG copper cables outdoors using to 50-60°C using 60 amps. The wires are wrapped with teflon to prevent damage to the cable. Can I use a ...
7
votes
1answer
594 views
Series pass transistor, LM7812
I am making a 12 volt regulator for a solar panel to power an audio amplifier. I already have a switching regulator for most application but it is very noisy for amplifier even with a lot of filtering....
0
votes
0answers
26 views
Shorting the output of both the channels of L298N
Suppose I started with a project requiring the control of motors and ended with using L298N in my project, realizing that my motor only takes around 1.5A when on load.
Now, with time I realized that ...
2
votes
1answer
88 views
High current, low voltage capacitors
I'm putting together a high current (200A+), low voltage (<5v) rectifier circuit.
I have sufficient bridge rectifiers, but to smooth out the waveform I need a strong enough capacitor bank. Besides ...
0
votes
1answer
84 views
Stabilize circuit on 5V 2A
I have not yet build following circuit:
Circuit in high performance needs 5V 1.7A (measured). I have source which is powerbank with 16 000 mAh. Outputting via ports: USB-C 5V/3A, USB-A 5V/3A, Micro-...
0
votes
1answer
122 views
Sizing a trace on a PCB to carry 50 amps
Currently working on a 4 layer pcb-card where I need to trace for 50 amps, any ideas how I can design it?
Any tips would be appreciated. Thanks!
1
vote
0answers
51 views
Electric heating for glass melting furnace
Some furnaces use electricity for glass melting. Low voltage and high amperage power is passed through the molten glass through 2 molybednum electrodes dipped into the glass. The molten glass acts as ...
2
votes
1answer
125 views
How to generate a high energy electromagnetic wave? Using high voltage or high current?
I am about generating an electromagnetic wave which should be powerful enough. So I should manipulate its electric field and magnetic field simultaneously. As far as I know E amplitude depends on the ...
0
votes
0answers
99 views
How to line a Metal Melter secondary for higher safety
A Metal Melter is a kind of home-made low voltage (less than 40 volts, mine is 3v) welder (small-scale) made from a microwave oven transformer (MOT). I left the primary intact (the thicker wire, which ...
1
vote
1answer
68 views
Switching high voltages with MOSFET at high frequencies
I need to rectify 220V 50Hz AC power to obtain 48V DC output voltage. Up to 40A current can be drawn from the DC side. 10% ripple is acceptable on the rectified voltage.
I am considering two ...
0
votes
1answer
47 views
How to control a lightbar with 20 individual modules? [closed]
The TL;DR version of my question is, how do you control 20 pieces of 12V/1A outputs in the most reliable, compact and cost efficient way, with something programmable?
The long version:
I got a ...
0
votes
4answers
179 views
Too High Voltage Drop across Transformer's Output
I want to get very high current flow thought secondary winding of transformer on my 3 Ohm load. As I apply high voltage of secondary to the load the voltage across it drops dramatically. Only about 2% ...
10
votes
7answers
2k views
How can the ACS712 pin handle 20 A?
I am searching for some current measuring ICs and found the ACS712, but what I can't figure out is how the seemingly small pins can handle the 20 A current since the trace width calculators say that I ...
0
votes
0answers
63 views
4 Layer board with high current return path inner layer
So I am doing a layout for a 4 layer PCB 1 ounce/layer. The Chip supports up to 20A (motor controller driver). The application needs about 12 amps max ( I plan it let it go up to 17A in the event of ...
0
votes
1answer
52 views
Specifying parts for Induction Heater; how to determine current requirements at transformer? [closed]
I'm working on specifying parts for the following circuit:
I intend to have a very large work coil, (like 12" diameter) so I'm expecting to need a lot of power. I'm on a tight budget, though, so ...
1
vote
2answers
183 views
IGBT destroyed. Help me identify any potential problems
I am trying to build an inductive oven control (for temperatures up to 1500 C), that controls the temperature by turning on the the inductive oven on and off like a commercial inductive hotplate.
...
1
vote
0answers
384 views
Pulsed DC, kA range inductive transient protection method
I would like to design a transient protection solution for HVDC_pulse_unit.
HVDC voltage = 3500V , current > 40kA.
Events:
D1 flyback diode survives(50kA surge forward current).
MOVs section did ...
0
votes
2answers
76 views
Can power transformers be used with higher voltages?
I purchased a Japanese transformer for a project I’m doing. It runs on 100VAC, not 120V, something I overlooked. Doing a quick search, Japan seems to use both 50/60Hz, based on the region.
It’s 30 ...
2
votes
2answers
65 views
Will a 300A HV connector fail before a 600A fuse does?
I know this is a silly question but I cannot find ant data indicated it will not. The HV connector rated at 300A @ 85C and it is a 600A fuse, I cannot find a connector with a higher current rating.
...
0
votes
1answer
51 views
MOSFET-switching between two power supplys: how to avoid transverse current?
For a hobby project I would like to switch between two power supplys.
The two power supplys are two 6s LiPo batteries. If one battery is empty i want to immediatelly switch to the other battery. (the ...
1
vote
2answers
107 views
Electrical Heater Confusion
I know that a semiconductor material, that is usually used for heaters in variety of application, heat up due to high current, which flows through them or high power dissipation across them.
But lets ...
0
votes
1answer
80 views
Looking for resources for determining cable requirements for high wattage (MW) applications
I'm doing some personal research on the specifications for cables that can handle megawatt power draws. As an example, the wires needed to supply 450VAC @ 2000A (0.9MW). I'm looking for wire diameters ...
0
votes
2answers
193 views
How to limit HV capacitor charging current?
I have a voltage doubler, which is connected to mains (without galvanic isolation):
It enticed me with its simplicity, configurability and option between charging speed or desulfatability.
The ...
6
votes
1answer
186 views
Switch high voltage with triggered spark gap
I want to switch a high current/voltage pulse (up to few 10kV, <1kA) from a capacitor as supply. It needs to be cheap and I don't care about efficiency too much yet.
I took a look at using ...
1
vote
0answers
232 views
Soldering sheet busbars to PCB concerns
Hello fellow engineers
I have decided to solder busbars to a high current pcb , but i have 2 concerns :
Does soldering a flat busbar (shown in left image) could cause thermal stress and deformation ...
0
votes
2answers
96 views
High current/high voltage/high frequency measurement
I have a circuit that I'm having trouble understanding. It measures the current flowing through a conductor. The measured load is 20-100 Amps, 9kHz-34kHz, and approx. 340 volts. The main conductor ...
1
vote
3answers
115 views
Why Does Flyback Current Destroy Darlington Buffered Op-Amp?
I am working on a project where I'd like to deliver variable DC control voltages to a continuous solenoid motor in order to achieve different velocities of actuation.
To buffer my DC control voltage ...
2
votes
2answers
299 views
16A Relay controlled with PWM
I am not very experienced with relays but I need to control the state of a relay with a PWM signal such that if the microcontroller is damaged and the controlling pin gets stuck in a high or low state ...
2
votes
0answers
291 views
TDA7294 100W Audio Amplifier Causing Unexpected Problems
This is the circuit I will be referring in this question:
TDA7294 is described in this data sheet. Upper IC with added external components is a well-known circuit and can be found on many websites ...
1
vote
0answers
133 views
Turn ON/OFF 5V 2-5A by Raspberry Pi GPIO
I need to control few 5V 2-5A devices by rpi GPIOs, which has the 3.3V logic level. I come up with a simple circuit, but I'll appreciate any ideas, corrections, suggestions. The LOAD is something like ...
0
votes
4answers
88 views
Can I provide a constant charge to a battery?
I have a sketch here of what seems like a solid plan. sketch
I need to provide a .2ohm coil around 3.7v which will take around 20 amps. The load will be very brief; 3-5 seconds, and intermittent; ...
0
votes
5answers
499 views
Best way to solder to a relay pin requiring ~30A of current?
On our hot tub circuit board, a trace on the PCB finally got cooked... Quite little damage, actually. The one trace is blackened, and the PCB now has a hole in it, but otherwise, everything looks ...
0
votes
1answer
77 views
Digital switch for 2000V capacitor [closed]
I want to produce a discharge of a capacitor against a test cell, as part of a study on high energy states of materials.
I'm using a standard microwave oven transformer as the power supply that I ...
0
votes
3answers
99 views
Protect power supply from regenerative drive
I am running a 3KW motor on a big 24Vdc power supply (Meanwell RST-5000), through a frequency drive.
When stopping the motor, however, I occasionally get a regenerative backcurrent that trips the ...
0
votes
2answers
147 views
Transimpedance Amplifier (TIA) - How to shunt high current spikes?
I am working on the design of a high-bandwidth transimpedance amplifier (TIA) to detect a relatively weak optical signal (100μW) but also be able to withstand short pulse, high power optical signals (>...
0
votes
1answer
85 views
Mosfet blows on high load using gate driver
I am using LM5060 from TI for switching big modular N channel MOSFET in SOT-227 package (IXFN420N10T) for relative high 100-200A loads.
On small loads like 10-20A it was working fine then we tried a ...
0
votes
2answers
100 views
Seeking recommendation for capacitor to handle high pulse current
I'm seeking recommendations for an inexpensive capacitor that will handle fairly-large pulse currents. Maximum voltage is 15 Vdc applied to the capacitor and I'd like to see current pulses in the ...
0
votes
3answers
543 views
Can I get a 150V DC output LM317HV-MIL
Can I get a 150V DC output from the circuit below by using LM317HV-MIL? As the voltage input I will be using a 160V unregulated input voltage from a rectifier.
If so, is there anything that I have ...
-5
votes
2answers
169 views
16Amp plug to 6Amp plug [closed]
I have 6Amp socket all around my home, but my washing machine has 16Amp plug.
Can convertor be used to plug 16 Amp in 6 amp socket somehow?
I am in India, so electricity is 240v50Hz
0
votes
2answers
135 views
High current in Coil/Inductor
I'm trying to build a 5V 8A buck converter and I chose the XL4016E1 IC for this operation (datasheet). There it says I need a 47uH 12A coil. Unfortunately i couldn't find a coild with such a high ...
2
votes
4answers
852 views
what is the temperature equilibrium for a copper conductor conducting 4000 Amps
I have a copper conductor with a total resistance of 1 miliohm and a passing current of 4000 Amps.
I want to know what the temperature equilibrium is for a conductor in the electrical grid (conductor ...
3
votes
1answer
156 views
High current plasma jet striking circuit
A little background: I'm a mechanical engineering graduate student with a focus in materials, so electrical engineering is not my core background. I'm conducting research on plasma surface treatment ...
0
votes
1answer
465 views
How can you calculate a railgun's exit velocity?
Having a cylindrical iron container with wall thickness of 20 cm, and a total weight of 50 tons when filled with its cargo, how would you be able to calculate its required voltage and current input in ...
0
votes
1answer
112 views
High Voltage Nodes creep-age and clearance standards for electronics?
I am trying to design with the NCV5183 with a 400V DC bus. I am trying to figure out the creepage/clearance standards i need to consider for high voltage layout and if the IC's pin to pin spacing is ...
0
votes
1answer
83 views
Power Supply for two 50V/12.5A Solenoids
I'm in the planning stages of building a custom pinball table and one of the sticking points is powering the flipper coils. They're 50V DC coils with a resistance of only 4 ohms during the stroke. ...
0
votes
0answers
75 views
20A current measurement with hall effect sensor
I am not aware of drawing more than 1A over PCB traces. We are planning to use ACS712 hall effect current sensor linked below:
https://www.amazon.in/KitsGuru-KG134-ACs712-Current-Arduino/dp/...
0
votes
2answers
339 views
OpAmp with high output current and capacitive load
I am trying to solve the following problem which - until today - I thought to be a trivial one: I have multiple reference voltages (from different sources) that I need to buffer and/or invert, filter ...
1
vote
0answers
152 views
Voltage Sucked Down on OPA541 (amplifier) Circuit Output
I am currently working on a design to generate a 5VAC (rms) @ 400Hz supply capable of 5A continuous. The design contains a non-inverting amplifier that takes a 213mV (rms) @ 400Hz voltage waveform (...
28
votes
6answers
5k views
How can the contact points of jumper cables handle the hundreds of amps required to start a car?
When jumpstarting a car, you connect those big alligator clamps to the terminals of the batteries. The cables themselves can handle the current just fine, but the contact points between the alligator ...
